EP0672474B1 - Verfahren zur Herstellung eines Rohres aus Zink oder aus Zinklegierungen - Google Patents

Verfahren zur Herstellung eines Rohres aus Zink oder aus Zinklegierungen Download PDF

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Publication number
EP0672474B1
EP0672474B1 EP94109167A EP94109167A EP0672474B1 EP 0672474 B1 EP0672474 B1 EP 0672474B1 EP 94109167 A EP94109167 A EP 94109167A EP 94109167 A EP94109167 A EP 94109167A EP 0672474 B1 EP0672474 B1 EP 0672474B1
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EP
European Patent Office
Prior art keywords
edges
melting
tube
process according
zinc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94109167A
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English (en)
French (fr)
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EP0672474A1 (de
Inventor
Andrea Mazzonetto
Giuseppe Mazzonetto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MAZZONETTO S.P.A.
Original Assignee
MAZZONETTO Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=11390573&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0672474(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by MAZZONETTO Srl filed Critical MAZZONETTO Srl
Publication of EP0672474A1 publication Critical patent/EP0672474A1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/17—Rigid pipes obtained by bending a sheet longitudinally and connecting the edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/02—Seam welding; Backing means; Inserts
    • B23K9/025—Seam welding; Backing means; Inserts for rectilinear seams
    • B23K9/0253—Seam welding; Backing means; Inserts for rectilinear seams for the longitudinal seam of tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow articles
    • B23K2101/06—Tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/08—Non-ferrous metals or alloys

Definitions

  • the present invention relates to a process for manufacturing tubes made of zinc or alloys thereof for sheet metal working.
  • Metal tubes generally made of copper, stainless steel, aluminum, pre-coated steel, zinc and alloys thereof et cetera, and constituted by sheet metal curved so as to mate two edges and then mutually couple them, are currently known and used in the field of sheet metal working for rain gutters.
  • the two edges have been mutually joined for many years substantially according to two methods: the first one consists in overlapping the two edges and soft-soldering them, and the second one entails the mechanical seaming of the two edges.
  • the limits and drawbacks include the use of more raw material than strictly necessary due to the seam, the fact that the manufactured tube is not tight since the seam is not sealed, the unaesthetic appearance of the seam, the limitation that it causes in installation, the poor mechanical strength due to the tendency of the material to form a loose seam due to its good elastic properties, and the lack of the possibility to widen the tubes in order to obtain mouthpieces.
  • figures 1 and 2 illustrate a conventional tube A made of zinc for sheet metal working with overlapping edges B and C and a soft-soldered joint D, respectively in a perspective view and in a sectional detail view of the region where the edges overlap and the soldered joint is formed.
  • Figures 3 and 4 instead are respectively a perspective view and a sectional detail view, taken at the region where the edges join, of a conventional tube E obtained from a curved plate with mutually seamed edges F and G.
  • DE-A-31 47 147 discloses a thin-walled tube with a straight seam which is manufactured by roll forming a strip into a tube, and aligning the strip edges of the tube such that a set gap is left between the edges.
  • the gap between the edges is 1/500 to 1/30 of the tube-diameter-to-wall-thickness ratio.
  • the tube is then subjected to an inert-gas-shielded non-consumable electrode welding, with the rate of welding and the welding amperage being selected such that to ensure the heat release in the welding zone to be sufficient to close the gap between the edges due to heat expansion of the tube material and the formation of a weld joint.
  • EP-A-0 284 141 discloses a process for producing zinc or zinc alloy thin-wall pipes, including rolling a thin sheet of material into a round C-section having a longitudinal slot disposed between mutually facing edges. The C-section is then guided with the facing edges through a relatively short area for heating by means of high frequency induction to a temperature below the melting point of the material, whereafter the longitudinal slot is made to converge in the form of a V-shaped gap converging to a welding point by pushing and joining the heated edges together by means of rollers.
  • a principal aim of the present invention is to provide a tube made of zinc or alloys thereof for sheet metal working which eliminates the above-described drawbacks in known types.
  • a consequent primary object is to eliminate overlap joints or unaesthetic seams currently provided in conventional tubes.
  • Another important object is to use less material to manufacture tubes made of zinc for sheet metal working and thus achieve savings from an economic point of view.
  • Another important object is to provide a tube that has a perfectly circular cross-section.
  • Another important object is to provide a tube that allows to eliminate limitations in installation or in forming widened portions for mouthpieces.
  • Another object is to provide a tube that offers the same mechanical seal in the edge joining region as in the rest of the tube.
  • Another object is to provide a tube which can be manufactured in unlimited lengths.
  • a tube made of zinc or alloys thereof for sheet metal working according to the invention comprises a curved plate 10 shaped by continuously forming a basic rolled part so that its width is equal to the intended diameter to be obtained.
  • the plate 10 is curved so that the edges 11 and 12, which are perfectly clean, are perfectly adjacent and pressed against each other end to end.
  • the pressing force provided by means of mutually perpendicular free rollers 13 and 14 which act on the flaps 11 and 12 and are pushed radially with respect to the tube (figure 7), is preferably comprised between 15 and 20 kg.
  • the two edges 11 and 12 are mutually joined by means of a welded joint 15 provided by continuous melting in controlled-atmosphere conditions (by providing a combustion chamber around the welding region); this melting is obtained by means of the intervention of a 500-Hz TIG generator that produces a controlled and localized heat energy beam.
  • Atmosphere control is performed to ensure that immediate oxidation does not occur after the melting of the material and to ensure fume control.
  • the final result is a tube with a perfectly circular cross-section in which it is difficult to visually locate the welding region with respect to the remaining part of the tube.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Arc Welding In General (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Coating With Molten Metal (AREA)
  • Laminated Bodies (AREA)
  • Laser Beam Processing (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Claims (7)

  1. Verfahren zur Herstellung eines Rohres aus Zink-oder aus Zinklegierungen, das folgende Schritte beinhaltet:
    ein Formen des Rohres durch kontinuiertiches Verformen eines gerollten Grundkörpers (10);
    ein Anordnen der Kanten (11, 12) des geformten Rohres gegenseitig Seite an Seite und Gegeneinanderpressen der Kanten genau, Ende an Ende; und
    ein örtliches, kontinuierliches Schmelzen der Kanten, die in gegenseitigem Kontakt angeordnet sind, unter Schutzgas mit einer Rauchkontrolle und derart, daß eine sofortige Oxidation des Materials nach dem Schmelzen nicht auftritt, und mit einem TIG-Strahl, der eine kontrollierte und lokalisierte Hitzeenergie produziert.
  2. Verfahren nach Anspruch 1, in dem der Schritt des Schmelzens so ausgeführt wird, daß der Schmelzbereich des Rohres auf die longituinalen Bereiche begrenzt ist, die an die Stoßlinie zwischen den beiden Kanten (11, 12) angrenzen.
  3. Verfahren nach einem oder mehreren der vorangehenden Ansprüche, wobei der Schritt des Schmelzens so ausgeführt wird, daß der die Hitzeenergie produzierende Strahl ein TIG-Strahl ist.
  4. Verfahren nach einem oder mehreren der vorangehenden Ansprüche, wobei die Schritte des Anordnens und Gegeneianderpressens der Kanten so ausgeführt ist, daß die Kraft, die auf die Kanten einwirkt, während des Schrittes des Schweißens zwischen 15 und 20 kg liegt.
  5. Verfahren nach einem oder mehreren der vorangehenden Ansprüche, wobei der Druck auf die Kanten durch senkrecht aufeinanderstehende freie Rollen (13, 14) erhalten wird, die so wirken, daß sie in radialer Richtung drücken.
  6. Verfahren nach einem oder mehreren der vorangehenden Ansprüche, wobei der Schritt des Schmelzens in einer Brennkammer ausgeführt wird, die um den Schweißbereich angeordnet ist.
  7. Verfahren nach einem oder mehreren der vorangehenden Ansprüche, wobei der Schritt des Schmelzens durch die Verwendung eines 500-Hz TIG-Generators ausgeführt wird, der einen kontrollierten und lokalisierten Hitzeenergiestrahl produziert.
EP94109167A 1994-02-18 1994-06-15 Verfahren zur Herstellung eines Rohres aus Zink oder aus Zinklegierungen Expired - Lifetime EP0672474B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPD940032 1994-02-18
IT1994PD000032A IT1268946B1 (it) 1994-02-18 1994-02-18 Struttura di tubo in zinco o sue leghe per lattoneria e procedimentoper la sua realizzazione

Publications (2)

Publication Number Publication Date
EP0672474A1 EP0672474A1 (de) 1995-09-20
EP0672474B1 true EP0672474B1 (de) 1998-02-11

Family

ID=11390573

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94109167A Expired - Lifetime EP0672474B1 (de) 1994-02-18 1994-06-15 Verfahren zur Herstellung eines Rohres aus Zink oder aus Zinklegierungen

Country Status (4)

Country Link
EP (1) EP0672474B1 (de)
AT (1) ATE163144T1 (de)
DE (1) DE69408524T2 (de)
IT (1) IT1268946B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004052080B4 (de) * 2004-10-26 2009-07-30 Zambelli Fertigungs Gmbh & Co. Kg Verfahren zum Herstellen eines Regenrinnenablaufbogens
CN102644842A (zh) * 2012-05-08 2012-08-22 安徽三山机械制造有限公司 一种连接管
CZ2017763A3 (cs) * 2017-11-29 2019-04-24 Hst Technologic S.R.O. Způsob výroby svařovaných tenkostěnných trubek z tabulového plechu

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3147147C2 (de) * 1981-11-27 1986-07-10 Gosudarstvennyj naučno-issledovatel'skij proektnyj i konstruktorskij institut splavov i obrabotki cvetnych metallov "Giprocvetmetobrabotka", Moskau/Moskva Verfahren zur Herstellung dünnwandiger Schweißrohre mit gerader Naht
DE3709784A1 (de) * 1987-03-25 1988-10-06 Rheinzink Gmbh Verfahren und vorrichtung zur herstellung von duennwandigen rohren

Also Published As

Publication number Publication date
EP0672474A1 (de) 1995-09-20
DE69408524T2 (de) 1998-07-02
ATE163144T1 (de) 1998-02-15
DE69408524D1 (de) 1998-03-19
ITPD940032A1 (it) 1995-08-18
ITPD940032A0 (it) 1994-02-18
IT1268946B1 (it) 1997-03-18

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